freebsd-dev/sbin/devd/devd.hh
Ian Lepore 5dfc0f6c53 Improve devd startup time, by tweaking some string handling routines that are
heavily used when parsing config files.  Mostly these changes avoid making
temporary copies of the strings, and avoid doing byte at a time append
operations, on the most-used code path.

On a 1.2 GHz ARM processor this reduces the time to parse the config files
from 13 to 6 seconds.

Reviewed by:	imp
Approved by:	cognet (mentor)
2013-01-30 23:37:35 +00:00

187 lines
5.2 KiB
C++

/*-
* Copyright (c) 2002-2003 M. Warner Losh.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef DEVD_HH
#define DEVD_HH
class config;
/**
* var_list is a collection of variables. These collections of variables
* are stacked up and popped down for each event that we have to process.
* We have multiple levels so that we can push variables that are unique
* to the event in question, in addition to having global variables. This
* allows for future flexibility.
*/
class var_list
{
public:
var_list() {}
virtual ~var_list() {}
/** Set a variable in this var list.
*/
void set_variable(const std::string &var, const std::string &val);
/** Get the variable out of this, and no other, var_list. If
* no variable of %var is set, then %bogus will be returned.
*/
const std::string &get_variable(const std::string &var) const;
/** Is there a variable of %var set in thi stable?
*/
bool is_set(const std::string &var) const;
/** A completely bogus string.
*/
static const std::string bogus;
static const std::string nothing;
private:
std::map<std::string, std::string> _vars;
};
/**
* eps is short for event_proc_single. It is a single entry in an
* event_proc. Each keyword needs its own subclass from eps.
*/
struct eps
{
public:
eps() {}
virtual ~eps() {}
/** Does this eps match the current config?
*/
virtual bool do_match(config &) = 0;
/** Perform some action for this eps.
*/
virtual bool do_action(config &) = 0;
};
/**
* match is the subclass used to match an individual variable. Its
* actions are nops.
*/
class match : public eps
{
public:
match(config &, const char *var, const char *re);
virtual ~match();
virtual bool do_match(config &);
virtual bool do_action(config &) { return true; }
private:
bool _inv;
std::string _var;
std::string _re;
regex_t _regex;
};
/**
* media is the subclass used to match an individual variable. Its
* actions are nops.
*/
class media : public eps
{
public:
media(config &, const char *var, const char *type);
virtual ~media();
virtual bool do_match(config &);
virtual bool do_action(config &) { return true; }
private:
std::string _var;
int _type;
};
/**
* action is used to fork a process. It matches everything.
*/
class action : public eps
{
public:
action(const char *cmd);
virtual ~action();
virtual bool do_match(config &) { return true; }
virtual bool do_action(config &);
private:
std::string _cmd;
};
struct event_proc
{
public:
event_proc();
virtual ~event_proc();
int get_priority() const { return (_prio); }
void set_priority(int prio) { _prio = prio; }
void add(eps *);
bool matches(config &) const;
bool run(config &) const;
private:
int _prio;
std::vector<eps *> _epsvec;
};
class config
{
public:
config() : _pidfile("") { push_var_table(); }
virtual ~config() { reset(); }
void add_attach(int, event_proc *);
void add_detach(int, event_proc *);
void add_directory(const char *);
void add_nomatch(int, event_proc *);
void add_notify(int, event_proc *);
void set_pidfile(const char *);
void reset();
void parse();
void close_pidfile();
void open_pidfile();
void write_pidfile();
void remove_pidfile();
void push_var_table();
void pop_var_table();
void set_variable(const char *var, const char *val);
const std::string &get_variable(const std::string &var);
const std::string expand_string(const char * var,
const char * prepend = NULL, const char * append = NULL);
char *set_vars(char *);
void find_and_execute(char);
protected:
void sort_vector(std::vector<event_proc *> &);
void parse_one_file(const char *fn);
void parse_files_in_dir(const char *dirname);
void expand_one(const char *&src, std::string &dst);
bool is_id_char(char) const;
bool chop_var(char *&buffer, char *&lhs, char *&rhs);
private:
std::vector<std::string> _dir_list;
std::string _pidfile;
std::vector<var_list *> _var_list_table;
std::vector<event_proc *> _attach_list;
std::vector<event_proc *> _detach_list;
std::vector<event_proc *> _nomatch_list;
std::vector<event_proc *> _notify_list;
};
#endif /* DEVD_HH */